132048domain: NAppears in sequencesNumbers k such that 2^(k+1) - 1 is prime.at n=29A090748Exponents m such that 1-A065395(2^m) is a power of 2, where A065395(n) = sigma(phi(n)) - phi(sigma(n)).at n=34A092591Number of obtuse isosceles triangles on an n X n grid.at n=24A190318